You're cracking me up

At bedtime we read to Luke a story of his choosing. Lately it's been a book titled, "Catalina Magdelena Hoopensteiner Wallendiner Hogan Logan Bogan Was Her Name." Seriously. When we finish he usually asks for it to be read again. Daddy or Mommy says, "Okay, one more time." To which Luke responds, "Two more times. You're cracking me up!" This always cracks us up. Where did he learn this phrase? I'm pretty sure it was me.